aqp (version 2.1.0)

previewColors: Preview Colors

Description

Preview colors arranged according to CIE2000 distances or manual specification.

Usage

previewColors(
  cols,
  method = c("grid", "MDS", "manual"),
  labels = NULL,
  labels.cex = 1,
  col.order = NULL,
  nrow = ceiling(sqrt(length(cols))),
  ncol = nrow,
  border.col = "black",
  pt.cex = 2,
  pt.pch = 15
)

Value

When method = "grid" or "manual" a vector of color order is returned. When method = "MDS", the output from MASS::cmdscale.

Arguments

cols

vector of R colors

method

either "grid", "MDS", or "manual", see details

labels

optional vector of labels, disabled when length(cols) > 5000

labels.cex

scaling factor for labels

col.order

integer vector used to order colors

nrow

number of rows used by "grid" method

ncol

number of columns used by "grid" method

border.col

border color used by "grid" method

pt.cex

point scaling factor used by "MDS" method

pt.pch

point symbol used by "MDS" method

Author

D.E. Beaudette

Details

Color sorting is based on CIE2000 distances as calculated by farver::compare_colour(). The "grid" method arranges colors in a rectangular grid with ordering based on divisive hierarchical clustering of the pair-wise distances. Unique colors are used when cols contains more than 5,000 colors.

The "MDS" method arranges unique colors via classical multidimensional scaling (principal coordinates) via cmdscale().

Colors can be manually arranged by supplying a vector of integers to col.order and setting method='manual'.

Examples

# example data
data(sp2)

# convert into SoilProfileCollection object
depths(sp2) <- id ~ top + bottom

previewColors(sp2$soil_color)
previewColors(sp2$soil_color, method = 'MDS', pt.cex = 3)

# create colors using HCL space
cols.hcl <- hcl(h = 0:360, c = 100, l = 50)

# grid, colors sorted by dE00
previewColors(cols.hcl)

# manual specification
previewColors(cols.hcl, method = 'manual', col.order = 1:361)

# MDS
previewColors(cols.hcl, method = 'MDS', pt.cex = 1)